R34 GTR stock rear muffler insights

[silencium]

Hi guys

Has anyone noticed that on the stock R34 GTR rear muffler the right tip is almost not been used? Firstly there is almost no black exhaust deposit, and secondly, after a drive that right one is is only warm, while you can't touch the left one without getting burned.

Is there maybe a spring loaded flap in the box that only opens up the right section at a certain amount of counter pressure? Or what is the reason for that?

[joshuaho96]

9 hours ago, silencium said:

Hi guys

Has anyone noticed that on the stock R34 GTR rear muffler the right tip is almost not been used? Firstly there is almost no black exhaust deposit, and secondly, after a drive that right one is is only warm, while you can't touch the left one without getting burned.

Is there maybe a spring loaded flap in the box that only opens up the right section at a certain amount of counter pressure? Or what is the reason for that?

There is a spring-loaded flap that only runs it at high enough flow rates. Nissan did this to reduce noise at low load/RPM while reducing backpressure at higher flow rates. 

[silencium]

Thanks for your enlightenment. That's what I though and what makes sense    Would you know of a picture or a diagram of that System by any chance?

[Duncan]

You may well be the only person in the world still choking an R34 GTR with a standard exhaust!

[silencium]

23 hours ago, Duncan said:

You may well be the only person in the world still choking an R34 GTR with a standard exhaust!

It's not quite like that  I've put that backbox on my daily S13. Got sick of the drone all aftermarket mufflers give, what is a problem of their design, because all of them are absorption type mufflers, and these just don't work for low frequencies. So that stock resonator type muffler (all oem mufflers are resonators) that is designed to work for a 300hp engine is the perfect solution for my daily. Also MOT is very strict in my country, so as a bonus its says "Nissan Calsonic" on the box  ;D

[joshuaho96]

On 8/13/2023 at 2:04 PM, silencium said:

Thanks for your enlightenment. That's what I though and what makes sense    Would you know of a picture or a diagram of that System by any chance?

Not sure there's any great pictures online, if you stick an inspection camera down the muffler you'll probably see it.

[Duncan]

57 minutes ago, silencium said:

It's not quite like that  I've put that backbox on my daily S13. Got sick of the drone all aftermarket mufflers give, what is a problem of their design, because all of them are absorption type mufflers, and these just don't work for low frequencies. So that stock resonator type muffler (all oem mufflers are resonators) that is designed to work for a 300hp engine is the perfect solution for my daily. Also MOT is very strict in my country, so as a bonus its says "Nissan Calsonic" on the box  ;D

In that case, you just quadrupled your car's value

[silencium]

Haha, the value of these S-chassis has climbed quite a lot too in the last years. A good unmolested OEM+ one is worth >40K AUD these days

[silencium]

On 8/15/2023 at 12:07 AM, joshuaho96 said:

Not sure there's any great pictures online, if you stick an inspection camera down the muffler you'll probably see it.

I will probably do that the next time I take it down  👍